Scholars who spent a great deal of their lives with the hadith of the Prophet (peace be upon him) developed a sense which they could use instantly in detecting error. Their example was like that of a man who lived with a beloved friend for scores of years, knew him very well in every situation and so could easily say which statement belonged to him and which not. Similarly, a literary critic who studies a poet for a long time and becomes fully acquainted with his style can, on the basis of his perception and personal experience, easily detect a poem which does not belong to the poet. However, Muhaddithin (hadith scholars) did not depend solely on personal experience as it may be counted a form subjective criticism. In short, if a hadith was not transmitted by any trustworthy scholar, and there was a liar or a person accused of lying in the chain of transmission it was said to have been fabricated by that person.